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◆ ima_adpcm_state_t
IMA (DVI/Intel) ADPCM conversion state descriptor. This defines the state of a single working instance of the IMA ADPCM converter. This is used for either linear to ADPCM or ADPCM to linear conversion.
◆ anonymous enum
Enumerator |
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IMA_ADPCM_IMA4 | IMA4 is the original IMA ADPCM variant
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IMA_ADPCM_DVI4 | DVI4 is the IMA ADPCM variant defined in RFC3551
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IMA_ADPCM_VDVI | VDVI is the variable bit rate IMA ADPCM variant defined in RFC3551
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◆ ima_adpcm_decode()
int ima_adpcm_decode |
( |
ima_adpcm_state_t * |
s, |
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int16_t |
amp[], |
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const uint8_t |
ima_data[], |
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int |
ima_bytes |
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) |
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Decode a buffer of IMA ADPCM data to linear PCM.
- Parameters
-
s | The IMA ADPCM context. |
amp | The audio sample buffer. |
ima_data | The IMA ADPCM data |
ima_bytes | The number of bytes of IMA ADPCM data |
- Returns
- The number of samples returned.
◆ ima_adpcm_encode()
int ima_adpcm_encode |
( |
ima_adpcm_state_t * |
s, |
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uint8_t |
ima_data[], |
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const int16_t |
amp[], |
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int |
len |
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) |
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Encode a buffer of linear PCM data to IMA ADPCM.
- Parameters
-
s | The IMA ADPCM context. |
ima_data | The IMA ADPCM data produced. |
amp | The audio sample buffer. |
len | The number of samples in the buffer. |
- Returns
- The number of bytes of IMA ADPCM data produced.
◆ ima_adpcm_free()
Free an IMA ADPCM encode or decode context.
- Parameters
-
- Returns
- 0 for OK.
◆ ima_adpcm_init()
Initialise an IMA ADPCM encode or decode context.
- Parameters
-
s | The IMA ADPCM context. |
variant | IMA_ADPCM_IMA4, IMA_ADPCM_DVI4, or IMA_ADPCM_VDVI. |
chunk_size | The size of a chunk, in samples. A chunk size of zero sample samples means treat each encode or decode operation as a chunk. |
- Returns
- A pointer to the IMA ADPCM context, or NULL for error.
◆ ima_adpcm_release()
Release an IMA ADPCM encode or decode context.
- Parameters
-
- Returns
- 0 for OK.